Video decoding device, video decoding method, video decoding program, and video decoding integrated circuit

Abstract

With use of a simplified program or calculating device for motion compensation, a video decoding device decodes video data compressed by motion detection operations on macroblock units, as in the MPEG-4AVC standard. The video decoding device splits compressed data blocks of the prescribed size, 16×16 pixels for instance, to generate sub-blocks, which are smaller than the blocks and on which the video decoding device is able to execute motion compensation operations. The video decoding device duplicates a motion vector assigned to a given block to generate an many motion vectors as there are sub-blocks in the given block, and executes motion compensation on each sub-block using the corresponding duplicate motion vector. Data resulting from the motion compensation operation on each sub-block is combined to obtain a target block corresponding to the given block.

What is claimed is: 
     
       1. A video decoding device for decoding encoded video data including a plurality of motion compensation blocks, each of the motion compensation blocks having been encoded by motion compensation, the video decoding device comprising:
 a processor; and 
 a non-transitory memory having stored thereon executable instructions, which when executed by the processor, cause the processor to perform:
 decoding a motion vector of the motion compensation block; 
 decoding data indicating a block size of a motion compensation block; 
 duplicating the decoded motion vector; and 
 performing motion compensation on the motion compensation block in units of a sub block having a respective block size using the duplicated motion vector of the motion compensation block as a motion vector of the sub block when the decoded block size of the motion compensation block is greater than the respective block size of the sub block. 
 
 
     
     
       2. A video decoding device for decoding encoded video data including a plurality of motion compensation blocks, each of the motion compensation blocks having been encoded by motion compensation, the video decoding device comprising:
 a processor; and 
 a non-transitory memory having stored thereon executable instructions, which when executed by the processor, cause the processor to perform:
 decoding a motion vector of the motion compensation block; 
 decoding data indicating a block size of a motion compensation block; 
 splitting the motion compensation block into a sub block having a respective block size; 
 duplicating the decoded motion vector; and 
 performing motion compensation on the motion compensation block in units of the sub block using the duplicated motion vector of the motion compensation block as a motion vector of the sub block when the decoded block size of the motion compensation block is greater than the respective block size of the sub block.